Pulp grinding stone



Oct. 25, 1932- H. P. SCHE'EL ET AL PULP GRINDING STONE Filed Aug. 29,1931 2 Sheets-Sheet 1 flfidckeel i7. BA'ckeeZ J2 Oct. 25, 1932.

PULP GRINDING STONE Filed Aug. 29. 1931 2 Sheets-Sheet 2 I ll If. P.dcheel 1.7. Rflckeel eff.

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awe/WM P. SCHEEL ET AL ,884,279

Patented Oct. 25, 1932. I

UNITED STATES PATENT OFFICE HANS I. SGHEEI. AND HANS P. SCHEEIJ, JR., OFTACOMA, WASHINGTON PULP GRINDING STONE Application filed August 29,1931. Serial No. 560,178.

This invention relates to the construction of grinding stones designedprimarily for use in grinding wood pulp. I

The primary. object of the invention IS the provis onof means wherebywarm water or steam may be used to supply or develop the necessaryexpansion to maintain the stone at a uniform temperature throughout theentire mass during the seasoning or hardening thereof, or may providemeans whereby cold water or air may be used to reduce the internal heatin the mass of plastic material during the curing process thereby providng a stbone which is exceptionally strong and dur- 1 a le.

V and claimed, itbeingunderstood that changes in the preclse embodimentof the invention.

herein disclosed, may be made within the scope of what is claimed,without departing from the spirit of the invention.

Referring to the drawings:

Figure 1 is a side elevational view of a grinding stone constructed inaccordance with the invention. v

Figure 2 is a longitudinal sectional view through the grinding stone.

Figure 3 is a sectional view through the grinding ring of the grindingstone, the remforcing wire being shown as wound spirally over the bodyportion.

Referring to the drawings in detail, the grinding stone comprises a coreor body portion indicated by the reference character 5, the same beingprovided with a central open r ing 6 to receive the shaft, on which thegrinding stone is mounted.

Another object of the invention is to pro- The grinding stone isconstructed of plastic material such as an especially prepared concrete,onstructed for grinding purposes, around wiich the reinforcing wirerings 7, are positioned. As shown in Fig. 2 the rings 7 are arranged inspaced relation to form a series of hoops.

The reference character 8'designates the grinding ring of the stone,which is also constructed of an especially prepared plastic material towithstand wear to which the stone is subjected, in grinding pulp. Asshown, the reinforcing wire 7 also imbedded in the grinding ring 8,securely anchoring the grinding ring in position.

A plural-iy of pipes indicated by the reference character 9 extendlongitudinally of the body portion'of the grinding stone, the ends beingopen to the atmosphere so that water, steam or other liquid may bepassed through the pipes, heating or cooling the body portion to auniform temperature throughout the entire mass.

Due to the heating of the body portion to a uniform temperature, anexceptionally hard and durable stone is produced which is capable ofwithstanding more heat than the natural stone now in common use.

After the seasoning of the stone, these pipes 9 may be filled withaplastic material, or the pipes may be removed, and the openings filled,thereby providing a solid mass.

As shown by Figure 3 of the drawings, the reinforcing wire, which isindicated by the reference character 10, is wound spirally over the bodyportion, to increase the strength of the stone.

It is also to be understood that although the hoops have been shown asconstructed of round material, other cross-sectional mater al maybeused.

Should it be desired to maintain the body portion cool, during thesetting of the plastic material of which the body portion is con- 90structed, cold water or air may be forced through the pipes 9.

Having thus described the invention, what is claimed is:

A method of constructing grinding stones, consisting in roviding a coreof plastic material, embed ing pipes in the core, the ends of the pipesterminating at the side faces of the core, and finally passing a mediumthrough the pipes to change the temperature .of the plastic material asthe plastic material is setting In testlmony that we claim the foregoingas our own, we have hereto aflixed our sig- HANS P. SCHEEL. HANS P.SOHEEL, JR.

5 natures.

